Manufacture, molding, and remolding of india-rubber goods.



'rnomns GARE, or raw nnmn'ron, 'nuenmn,

MANUFACTURE, monnmm' mn nnmonnme or" mnm nUnBEn GOODS.

No Drawing.

, Specification of letters Yatent. Application flied Augusta, 1810. Serial No. 576,966. I

Patented Apr. 1c, 1912.

To all whom it may concern:

Be it known that I, 'THoMAs GARE, subject of the King of Great Britain, residing at Bramble Beach, Warren Drive, New

Brighton, in the county of Chester,-England a engmeer, have invented certain new and use? ful Improvements Relating to the ture, Molding, and Remoldin of India- Rubber Goods, of which the f0 lowing is a specification. L

My invention relates to the manufacture, molding and remolding of indie-rubber goods according tothe process described and claimed in my specification No. 332.103-filed Aug. 27 1906 and it has for its object an improved method of carrying the process into effect. t

By the process hereinbefore referred to, the rubber, whether in one iece or many pieces or in powder, is pressed sufiiciently to expel the air from the mold and subsequently heated to a temperature suflicient to convert the rubber into a homogeneous mass aking the shape of the mold without in any way deteriorating the character of the rubber.

According to my present invention, I compress the rubber to expel the air by means of a hot plate or plates, but I interpose betweenthe plate or plates and the rubber a sheet or sheets of a suitable material which will retard the transmission 'of the heat of the plate to the rubber until after the rubber has been compressed to expel the air.

In practice I find a iece of pa" r or a thin plate of metal is sufiicient to elay the action of the heat durin the compression of the rubber if accomp ished rapidly, by affording a temporary insulation. Advantage may be taken of this fact to produce an ornamented surface or relief design on rubber by placing a temporarily-insulating sheet upon the rubber or powdered rubber and'then placing thereupon a heated plate,

Manufac which is of a temperature higher than ordinary vulcanization heat, and immediately sub ecting the whole to pressure until the plate has cooled below the temperature at which the rubber would be likely to resume its original shape. I

The invention is applicable for use in connection withthe apparatus described in my specification No. 576965 filed Aug. 13, 1910, and shown in Figures 9 and 10 of the drawings as an alternative to the heating of the tubular molds For this purpose I may.

heat theplates beforedelivering them to the mold and interpose a temporarily insulating sheet between the hot plates and the rubber so that the full compression and expulsion of air from the rubber is accom plished before the heat begins to afl'ect the rubber. t

' Claim .v

The method of manufacturing, molding, and remolding india rubber goods consisting in comminuting the rubber placing upon or against the comminuted rubber a sheet of a temporarily heat-insulating material and sub ectin the rubber thus protected to compression y a presser member which has been previously heated to a temperature above ordinary vulcanization heat, to compress the rubber and expelvthe air therefrom, the interposition of said sheet serving to retard the transmission of heat from said presser member to the rubber until after the full compression of said rubber and expulsion of an from the same have been elfected.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS GARE.

Witnesses:

GEORGE C. Dowmno, WALTER J. SKERTEN. 

